Can't speak for OP but I too attend my wife's church pretty frequently. I'm probably more agnostic than an atheist but have found her UU (Unitarian Universalist

Can't speak for OP but I too attend my wife's church pretty frequently. I'm probably more agnostic than an atheist but have found her UU (Unitarian Universalist) church pretty welcoming and found a ton of like minded folks there. I wouldn't call it an atheist church but lots of self described atheist attend. The basic tenants or '6 principles' that the church holds are all things I subscribe to in my personal beliefs anyway (basically respect other people) and most of the sermons are fairy interesting and cover lots of different religions, philosophies, and ideas (bonus: the whole thing wraps up in under an hour!). There are tons of smaller groups that meet outside of regular services to discuss everything from Christianity to Hinduism as well as more general philosophy and social work. As well as things such as neighborhood groups, parenting groups, gardening groups.